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#![warn(missing_docs)] //! This crate provides a Rust wrapper to the [Oracle Call Interface][1] (OCI) library. //! The Oracle site describes OCI as a "...comprehensive, high performance, native C //! language interface to Oracle Database for custom or packaged applications...". //! //! # Overview //! //! The OCI library is the original Oracle C API for interacting with their database. It is the one //! that later versions of JDBC is built on for example. Recently Oracle has released a new API //! called the [Oracle Database Programming Interface for Drivers and Applications][2] (ODPI-C) //! that is supposed to simplify use of OCI, however the documentation for OCI //! is more extensive and therefore easier to build a wrapper on top of. //! //! The OCI library is large and supports many use cases for interacting with a database. This //! crate is currently concerned with support for executing SQL statements and so is limited when //! compared to the whole of OCI. //! //! The overall design will be familiar to anyone who has used Java's JDBC, Haskell's HDBC or //! Rust's [postgres][3] crate. Indeed, most design decisions were //! made based on reviewing the API of these libraries. //! //! The basics are simple: a [`Connection`][4] represents a connection to a database, this connection //! can be used to prepare one or more [`Statement`][5]s which are then used to execute SQL against the //! database. If there are results then they can be returned all at once or lazily via an iterator. //! Datatypes are represented using [`SqlValue`][6] and allow type conversion from Oracle //! to Rust types. //! //! ## Missing type conversions //! //! Currently only `String`, `i64` and `f64` are supported. In Oracle terms this means that anything //! held in columns as `VARCHAR`, `VARCHAR2` and `Number` can be retrieved. As Oracle uses `Number` to //! respresent all number types then this is less restricting that it first appears. More types //! will be added. //! //! # Setup //! //! This crate is developed against version 12.2 of the OCI library. It is expected to work with //! 12.x.x but is not tested. The OCI client library needs to be installed on your machine and can be //! downloaded [here][7]. //! //! If you are on Linux then you are likely to need to tell the linker where //! to find the files. Adding this to my `.bashrc` file worked for me, however the details may vary //! according to your distro, mine is [OpenSuse][8]. //! //! ```text //! export LIBRARY_PATH=$LIBRARY_PATH:/usr/lib/oracle/12.2/client64/lib/ //! ``` //! //! This crate has not been tested against Windows and so the setup will be different. //! //! Testing has been done against a local installation of [Oracle 11g Express Edition][9]. //! In order to run the crate tests then a local database needs to be //! available on `localhost:1521/xe` with a user `oci_rs` and password `test`. //! //! In order to use `oci_rs` add this to your `Cargo.toml`: //! //! ```toml //! [dependencies] //! oci_rs = "0.3.0" //! ``` //! and this to your crate root: //! //! ```rust //! extern crate oci_rs; //! ``` //! //! # Examples //! //! In the following example we will create a connection to a database and then create a table, //! insert a couple of rows using bind variables and then execute a query to fetch them back again. //! There is a lot of error handling needed. Every OCI function call can fail and so `Result` and //! `Option` are used extensively. The below code takes the usual documentation shortcut of calling //! `unwrap()` a lot but doing so in real client code will prove ill-fated. Any remote database connection is //! inherently unreliable. //! //! ```rust //! use oci_rs::connection::Connection; //! //! let conn = Connection::new("localhost:1521/xe", "oci_rs", "test").unwrap(); //! //! # let mut drop = conn.create_prepared_statement("DROP TABLE Toys").unwrap(); //! # drop.execute().ok(); //! //! // Create a table //! let sql_create = "CREATE TABLE Toys (ToyId int, //! Name varchar(20), //! Price float)"; //! let mut create = conn.create_prepared_statement(sql_create).unwrap(); //! //! // Execute the create statement //! create.execute().unwrap(); //! //! // Commit in case we lose connection (an abnormal disconnection would result //! // in an automatic roll-back.) //! create.commit().unwrap(); //! //! // Insert some values using bind variables //! let sql_insert = "INSERT INTO Toys (ToyId, Name, Price) //! VALUES (:id, :name, :price)"; //! let mut insert = conn.create_prepared_statement(sql_insert).unwrap(); //! //! let values = [(1, "Barbie", 23.45), //! (2, "Dinosaurs", -5.21)]; //! //! // Run through the list of values, bind them and execute the statement //! for value in values.iter() { //! insert.bind(&[&value.0, &value.1, &value.2]).unwrap(); //! insert.execute().unwrap() //! } //! //! insert.commit().unwrap(); //! //! // Create a query //! let sql_select = "SELECT * FROM Toys //! WHERE Name='Barbie'"; //! //! let mut select = conn.create_prepared_statement(sql_select).unwrap(); //! //! // Execute //! select.execute().unwrap(); //! //! // Get the result set //! let result_set = select.result_set().unwrap(); //! assert_eq!(result_set.len(), 1); //! let first_row = &result_set[0]; //! //! // Types are automatically converted //! let id: i64 = first_row[0].value().unwrap(); //! let name: String = first_row[1].value().unwrap(); //! let price: f64 = first_row[2].value().unwrap(); //! //! assert_eq!(id, 1); //! assert_eq!(name, "Barbie"); //! assert_eq!(price, 23.45); //! //! ``` //! # OCI docs //! //! Documentation for the underlying OCI library can be found [here][10] and error codes and their //! descriptions [here][11]. The error descriptions are useful because they often contain //! additional information that is not included in the text returned from the library. //! //! [1]: http://www.oracle.com/technetwork/database/features/oci/index-090945.html //! [2]: https://github.com/oracle/odpi //! [3]: https://crates.io/crates/postgres //! [4]: connection/struct.Connection.html //! [5]: statement/struct.Statement.html //! [6]: types/enum.SqlValue.html //! [7]: http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html //! [8]: https://www.opensuse.org/ //! [9]: http://www.oracle.com/technetwork/database/database-technologies/express-edition/overview/index.html //! [10]: http://docs.oracle.com/database/122/LNOCI/toc.htm //! [11]: https://docs.oracle.com/database/122/ERRMG/toc.htm //! extern crate libc; extern crate byteorder; /// Connections to a database. /// /// The current implementation only supports a simple connection to the database. There is /// one user session, but multiple statements can be created. Multiple connections can be created /// safely because it defaults to setting the OCI environment mode as multi-threaded and /// therefore the OCI library takes care of concurrency. The cost of this is that a purely single /// threaded client application might run slower. /// /// More advanced connection options such as connection and statement pooling are not yet /// available. /// /// # Examples /// /// Connection and statement creation with error handling: /// /// ```rust /// use oci_rs::connection::Connection; /// /// let connection = match Connection::new("localhost:1521/xe", /// "oci_rs", /// "test") { /// Ok(conn) => conn, /// Err(err) => panic!("Failed to create a connection: {}", err), /// }; /// /// let sql_create = "CREATE TABLE Cats (CatId INTEGER, /// Name VARCHAR(20))"; /// /// let create = match connection.create_prepared_statement(sql_create) { /// Ok(stmt) => stmt, /// Err(err) => panic!("Failed to create a statement: {}", err), /// }; /// ``` /// pub mod connection; /// Errors. /// /// Any errors arising from interaction with the OCI library will be returned as an `OciError`. All /// Oracle errors will be returned as the `OciError::Oracle` type. The Oracle error /// code and description can be seen through this. /// /// # Examples /// /// Here is an example of how an Oracle error will reach you if you choose to display it: /// /// ```rust,should_panic /// use oci_rs::connection::Connection; /// /// let conn = Connection::new("localhost:1521/xe", "oci_rs", "test").unwrap(); /// /// // Create a table /// let sql_create = "CREATE TABLE BrokenToys (ToyId int, /// Name varchar(20), /// Price sink)"; /// let mut create = conn.create_prepared_statement(sql_create).unwrap(); /// if let Err(err) = create.execute() { /// panic!("Execution failed: {}", err) /// } /// ``` /// /// The above code will produce the following (this specific output comes from /// running this documentation test without the `should_panic` attribute): /// /// ```text /// thread 'main' panicked at 'Execution failed: Executing statement /// Error number: 1 /// Error code: ORA-902 /// Error text: ORA-00902: invalid datatype /// ', <anon>:13 /// note: Run with `RUST_BACKTRACE=1` for a backtrace. /// ``` /// In this case "sink" is not a valid SQL data type. /// /// Note that there might be more than one error and in such cases all errors will be listed, this /// is why there is an error number. /// pub mod oci_error; /// Types used in conversion between OCI and Rust types. /// /// This module provides a type `SqlValue` and two traits `ToSqlValue` and `FromSqlValue` that /// allow the underlying OCI types to be converted into Rust types. They do not map exactly to the /// corresponding SQL standard types. /// /// For number types in particular there are less `SqlValue`s than SQL types. Inside Oracle all /// numbers are stored as a `NUMBER`. This is an Oracle format that can handle all integer and /// float values with a precision of 38 digits. Regardless of whether the SQL statement specifies /// an `INTEGER` or `FLOAT` or `LONG`, Oracle will store it as a `NUMBER`. The OCI library then allows you /// to convert it into any numeric type you like, but that forces you to explicitly state the type /// of the columns when retrieving the values. To avoid this, this crate makes some executive /// decisions based on the `NUMBER` value. As per the OCI documentation the basic type of a number can be /// determined by the scale and precision of the `NUMBER` value. If the precision is non-zero and /// scale is -127 then the number is a `FLOAT` otherwise we can consider it an `INTEGER`. /// So, according to this logic the caller will receive either `SqlValue::Integer` or `SqlValue::Float`. /// These two variants contain an `i64` and `f64` respectively. If a smaller type is needed in Rust code, /// then further conversions can be made. This appears to be sufficient to allow retrieval of data in /// queries, without having specify column types on the Rust side ahead of time. /// /// Note: Oracle also supports types known as `BINARY_FLOAT` and `BINARY_DOUBLE`. These can also be /// used to store numbers inside the database as an alternative to `NUMBER`. They are not currently /// supported. /// /// The traits allow conversion to and from Rust types into `SqlValue`. /// /// # Examples /// /// This example highlights the automatic conversion. If it is confusing then I suggest reading /// [Communicating Intent][1] as it explains very well how Rust's trait system makes this work, /// the [`postgres`][2] crate also makes use of the same process to /// convert the column values in a result row into Rust. This crate copies `postgres`'s approach except that it /// makes use of an intermediary `SqlValue` instead of returning a trait. I think that it is fair /// to argue that `SqlValue` is not needed, `postgres` skips such an intermediary value, but using /// it simplifies the current implementation. /// /// ```rust /// use oci_rs::connection::Connection; /// /// let conn = Connection::new("localhost:1521/xe", "oci_rs", "test").unwrap(); /// # let mut drop = conn.create_prepared_statement("DROP TABLE Men").unwrap(); /// # drop.execute().ok(); /// /// // Create a table /// let sql_create = "CREATE TABLE Men (ManId INTEGER, /// Name VARCHAR2(20), /// Height FLOAT)"; /// /// let mut create = conn.create_prepared_statement(sql_create).unwrap(); /// /// // Execute the create statement /// create.execute().unwrap(); /// /// // Commit in case we lose connection (an abnormal disconnection would result /// // in an automatic roll-back.) /// create.commit().unwrap(); /// /// // Insert some values /// let sql_insert = "INSERT INTO Men (ManId, Name, Height) /// VALUES (1, 'Roger', 183.4)"; /// let mut insert = conn.create_prepared_statement(sql_insert).unwrap(); /// /// insert.execute().unwrap(); /// insert.commit().unwrap(); /// /// // Create a query /// let sql_select = "SELECT * FROM Men"; /// /// let mut select = conn.create_prepared_statement(sql_select).unwrap(); /// /// // Execute /// select.execute().unwrap(); /// /// // Get the result set /// let result_set = select.result_set().unwrap(); /// assert_eq!(result_set.len(), 1); /// let first_row = &result_set[0]; /// /// // Types are automatically converted /// let id: i64 = first_row[0].value().unwrap(); /// let name: String = first_row[1].value().unwrap(); /// let height: f64 = first_row[2].value().unwrap(); /// /// assert_eq!(id, 1); /// assert_eq!(name, "Roger"); /// assert_eq!(height, 183.4); /// /// // Integer and Float can also be turned into Strings /// let id_as_string: String = first_row[0].value().unwrap(); /// let height_as_string: String = first_row[2].value().unwrap(); /// /// assert_eq!(id_as_string, "1"); /// assert_eq!(height_as_string, "183.4"); /// ``` /// /// [1]: https://github.com/jaheba/stuff/blob/master/communicating_intent.md /// [2]: https://crates.io/crates/postgres pub mod types; /// Rows of data returned from a query /// /// A `Row` represents a row of data returned from a SQL query. Internally it holds the columns /// and their values. It implements the `Index` trait and so columns can be accessed via an index /// number. /// pub mod row; /// SQL statements run against the database. /// /// `Statement`s are created to run a SQL Statement against a database. They prepare the statement /// for execution and allow bind variables to be set. If there are results then these these can be /// returned all in one go or lazily through an iterator. /// /// # Overview /// /// The process is as follows: /// /// 1. Create a `Statement` from a connection with a given SQL statement. This will create a /// prepared statement on the Oracle side. /// 2. If the SQL contains bind variable placeholders then these values should now be set via a /// call to `.bind`. Although OCI supports both positional and named bind variables, only /// positional are curently support by `Statement`. Oracle uses the form `:name` where `name`is /// the bind variable. /// 3. Execute the statement. /// 4. Commit the transaction if data was changed. Oracle implicitly creates a transaction when data /// is changed and commits automatically with a normal session close and log-off. If we /// disconnect abnormally however, a rollback is initiated. /// 5. If there are results i.e. it was a `SELECT` statement, then fetch the results. The entire /// result set can be returned as a `Vec<Row>` or instead an iterator can be used to return the /// `Row`s one by one. These are fetched from OCI by the iterator as needed. /// /// A connection can create multiple `Statement`s. In the examples in this document there is /// usually one for each of the `DROP`, `CREATE`, `INSERT` and `SELECT` SQL statements used in the /// examples. /// /// # Examples /// /// We will run through the above process to create a table, add some values and then return them /// lazily. Every OCI call can fail and the below example avoids handling errors in order to make /// the example easier to read, notice how many `.unwrap`s are here. /// /// ```rust /// use oci_rs::connection::Connection; /// use oci_rs::row::Row; /// /// let conn = Connection::new("localhost:1521/xe", "oci_rs", "test").unwrap(); /// # let mut drop = conn.create_prepared_statement("DROP TABLE Cities").unwrap(); /// # drop.execute().ok(); /// /// // Create a table /// let sql_create = "CREATE TABLE Cities (CityId INTEGER, /// Name VARCHAR(20))"; /// /// let mut create = conn.create_prepared_statement(sql_create).unwrap(); /// /// // Execute the create statement /// create.execute().unwrap(); /// /// // Commit in case we lose connection (an abnormal disconnection would result /// // in an automatic roll-back.) /// create.commit().unwrap(); /// /// // Insert some values using bind variables /// let sql_insert = "INSERT INTO Cities (CityId, Name) /// VALUES (:id, :name)"; /// let mut insert = conn.create_prepared_statement(sql_insert).unwrap(); /// /// let values = vec![(1, "Paris"), /// (2, "London"), /// (3, "Hamburg"), /// (4, "Miami")]; /// /// // Run through the list of values, bind them and execute the statement /// for value in values.iter() { /// insert.bind(&[&value.0, &value.1]).unwrap(); /// insert.execute().unwrap() /// } /// /// insert.commit().unwrap(); /// /// // Create a query /// let sql_select = "SELECT * FROM Cities"; /// /// let mut select = conn.create_prepared_statement(sql_select).unwrap(); /// /// // Execute /// select.execute().unwrap(); /// /// // Get the result set row by row from an iterator /// for (index, row_result) in select.lazy_result_set().enumerate(){ /// let row = row_result.unwrap(); /// let city_id: i64 = row[0].value().unwrap(); /// let city_name: String = row[1].value().unwrap(); /// assert_eq!(city_id, values[index].0); /// assert_eq!(city_name, values[index].1); /// } /// /// // Or perhaps something a bit more convoluted just to make use of iterator adapters /// /// // Execute again to get fresh results /// select.execute().unwrap(); /// /// // Get cities containing an 'a': /// let results: Vec<String> = select.lazy_result_set() /// .map(|row_result| { /// let row = row_result.unwrap(); /// row[1].value::<String>().unwrap() /// }) /// .filter(|city| city.contains("a")) /// .collect(); /// /// let correct_result = vec!["Paris".to_string(), /// "Hamburg".to_string(), /// "Miami".to_string()]; /// assert_eq!(results, correct_result); /// ``` /// The final example is a bit awkard because we have `Result`s and `Option`s to deal with /// (or ignored as in this case) but it is added as a reminder that iterator methods can be used. /// pub mod statement; mod oci_bindings; #[cfg(test)] mod tests { use connection::Connection; const CONNECTION: &str = "localhost:1521/xe"; const USER: &str = "oci_rs"; const PASSWORD: &str = "test"; #[test] #[allow(unused_variables)] fn create_connection() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; } #[test] fn create_prepared_statement() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Books"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(s) => s, Err(err) => panic!("Failed to prepare drop Books: {}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Books(BookID int, Name varchar(200))"; let mut stmt = match conn.create_prepared_statement(sql_create) { Ok(s) => s, Err(err) => panic!("Failed to create a statement: {}", err), }; if let Err(err) = stmt.execute() { panic!("Failed to execute: {}", err) } if let Err(err) = stmt.commit() { panic!("Failed to commit: {}", err) } } #[test] fn bind() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Fruit"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(s) => s, Err(err) => panic!("{}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Fruit(FruitId integer, Name varchar(20))"; let mut create = match conn.create_prepared_statement(sql_create) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = create.execute() { panic!("{}", err) } let sql_insert = "INSERT INTO Fruit(FruitId, Name) VALUES(:id, :name)"; let mut insert = match conn.create_prepared_statement(sql_insert) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; let name = String::from("Apple"); let id: i64 = 22; if let Err(err) = insert.bind(&[&id, &name]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } let name = String::from("Pear"); let id: i64 = 23; if let Err(err) = insert.bind(&[&id, &name]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } if let Err(err) = insert.bind(&[&24, &"Banana".to_string()]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } if let Err(err) = insert.commit() { panic!("{}", err) } } #[test] fn query() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Cars"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(s) => s, Err(err) => panic!("{}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Cars(CarId integer, Name varchar(20))"; let mut create = match conn.create_prepared_statement(sql_create) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = create.execute() { panic!("{}", err) } let sql_insert = "INSERT INTO Cars(CarId, Name) VALUES('12', 'BMW')"; let mut insert = match conn.create_prepared_statement(sql_insert) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = insert.execute() { panic!("{}", err) } let sql_query = "SELECT * FROM Cars"; let mut select = match conn.create_prepared_statement(sql_query) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = select.execute() { panic!("{}", err) } let result_set = match select.result_set() { Ok(res) => res, Err(err) => panic!("{}", err), }; if result_set.is_empty() { panic!("Should not have an empty result") } let row = &result_set[0]; let car_id: i64 = row[0].value().expect("Not an i64"); assert_eq!(car_id, 12); let car_name: String = row[1].value().expect("Not a string"); assert_eq!(car_name, "BMW") } #[test] fn multi_row_query() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Flowers"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Flowers(FlowerId integer, Name varchar(20))"; let mut create = match conn.create_prepared_statement(sql_create) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = create.execute() { panic!("{}", err) } let sql_insert = "INSERT INTO Flowers(FlowerId, Name) VALUES(:id, :name)"; let mut insert = match conn.create_prepared_statement(sql_insert) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = insert.bind(&[&1, &"Rose".to_string()]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } if let Err(err) = insert.bind(&[&2, &"Tulip".to_string()]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } let sql_query = "SELECT * FROM Flowers"; let mut select = match conn.create_prepared_statement(sql_query) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = select.execute() { panic!("{}", err) } let result_set = match select.result_set() { Ok(res) => res, Err(err) => panic!("{}", err), }; if result_set.is_empty() { panic!("Should not have an empty result") } let pairs = [(1, "Rose"), (2, "Tulip")]; for (index, pair) in pairs.iter().enumerate() { let row = &result_set[index]; let flower_id: i64 = row[0].value().expect("Not an i64"); let flower_name: String = row[1].value().expect("Not a string"); assert_eq!(flower_id, pair.0); assert_eq!(flower_name, pair.1); } } #[test] fn lazy_multi_row_query() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Birds"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Birds(BirdId integer, Name varchar(20))"; let mut create = match conn.create_prepared_statement(sql_create) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = create.execute() { panic!("{}", err) } let sql_insert = "INSERT INTO Birds(BirdId, Name) VALUES(:id, :name)"; let mut insert = match conn.create_prepared_statement(sql_insert) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = insert.bind(&[&1, &"Chafinch".to_string()]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } if let Err(err) = insert.bind(&[&2, &"Eagle".to_string()]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } let sql_query = "SELECT * FROM Birds"; let mut select = match conn.create_prepared_statement(sql_query) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = select.execute() { panic!("{}", err) } let mut result_set = Vec::new(); for row_result in select.lazy_result_set() { match row_result { Ok(row) => result_set.push(row), Err(err) => panic!("{}", err), } } if result_set.is_empty() { panic!("Should not have an empty result") } let pairs = [(1, "Chafinch"), (2, "Eagle")]; for (index, pair) in pairs.iter().enumerate() { let row = &result_set[index]; let bird_id: i64 = row[0].value().expect("Not an i64"); let bird_name: String = row[1].value().expect("Not a string"); assert_eq!(bird_id, pair.0); assert_eq!(bird_name, pair.1); } } #[test] fn number_conversion() { let conn = match Connection::new(CONNECTION, USER, PASSWORD) { Ok(conn) => conn, Err(err) => panic!("Failed to create a connection: {}", err), }; let sql_drop = "DROP TABLE Sweets"; let mut drop = match conn.create_prepared_statement(sql_drop) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; drop.execute().ok(); let sql_create = "CREATE TABLE Sweets(SweetId integer, Name varchar(20), Price float)"; let mut create = match conn.create_prepared_statement(sql_create) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = create.execute() { panic!("{}", err) } let sql_insert = "INSERT INTO Sweets(SweetId, Name, Price) VALUES(:id, :name, :price)"; let mut insert = match conn.create_prepared_statement(sql_insert) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; let values = [(1, "Toffee", 22.5), (2, "Haribo", -4.0), (3, "Gobstoppers", 34.5657)]; for value in values.iter() { if let Err(err) = insert.bind(&[&value.0, &value.1.to_string(), &value.2]) { panic!("{}", err) } if let Err(err) = insert.execute() { panic!("{}", err) } } let sql_query = "SELECT * FROM Sweets"; let mut query = match conn.create_prepared_statement(sql_query) { Ok(stmt) => stmt, Err(err) => panic!("{}", err), }; if let Err(err) = query.execute() { panic!("{}", err) } let result_set = match query.result_set() { Ok(res) => res, Err(err) => panic!("{}", err), }; if result_set.is_empty() { panic!("Should not have an empty result") } for (index, value) in values.iter().enumerate() { let row = &result_set[index]; let sweet_id: i64 = row[0].value().expect("Not an i64"); let sweet_name: String = row[1].value().expect("Not a string"); let sweet_price: f64 = match row[2].value() { Some(p) => p, None => panic!("{:?}", row[2]), }; assert_eq!(sweet_id, value.0); assert_eq!(sweet_name, value.1); assert_eq!(sweet_price, value.2); } } }